[REBOL] Re: New version of AT
From: massung::gmail::com at: 21-Mar-2006 8:52
Yes they do! :-)
Thank you very much. Sometimes little tidbits like this are hard to find in
the documentation. But I am always quite surprised at how REBOL usually has
a way to do "what I want".
Thanks again!
Jeff M.
On 3/21/06, Karol Go¼liński <kgozlinski-neokartgis.com.pl> wrote:
>
> sorry there is lack of link
> you can read about New Path Forms in Version 2.5.55 in
> http://www.rebol.net/article/0025.html
>
> Karol
>
> ----- Original Message -----
> From: "Karol Go¼liński" <kgozlinski-neokartgis.com.pl>
> To: <rebolist-rebol.com>
> Sent: Tuesday, March 21, 2006 8:36 AM
> Subject: [REBOL] Re: New version of AT
>
> >
> > Hi!
> > Does New Path Forms in Version 2.5.55 suits your needs?
> > In the same way you can access multi-dimentional blocks
> > like this :
> >
> >>> data: [ [7 9] [5 3]]
> > == [[7 9] [5 3]]
> >>> i: 1
> > == 1
> >>> n: 2
> > == 2
> >>> data/(i)/(n)
> > == 9
> >>> data/(i)/(i + 1): 13
> > == 13
> >>> data/:i/:n
> > == 13
> >>> data/:i/:i: 19
> > == 19
> >>> data
> > == [[19 13] [5 3]]
> >
> > Karol
> >
> >
> > ----- Original Message -----
> > From: "Jeff Massung" <massung-gmail.com>
> > To: <rebolist-rebol.com>
> > Sent: Tuesday, March 21, 2006 1:34 AM
> > Subject: [REBOL] New version of AT
> >
> >
> >> So, one of the few frustrations I've had with REBOL has been in regards
> >> to
> >> multi-dimentional array manipulation. I haven't found anything in the
> >> REBOL
> >> dictionary to do what I want, so I put together a simple utility
> function
> >> (PEEK, my own version of AT). I thought I'd post it here real quick,
> and
> >> see
> >> if the basic functionality I'm looking for already exists (and if not,
> >> why?).
> >>
> >> The basic idea is to use one function to both access and set values in
> >> multi- (or one-) dimensional array. I'm kind of borrowing this from
> >> Lisp's
> >> (aref ...) and (setf (aref ...) value). The general idea being that you
> >> can
> >> pass an integer, a pair, or a block of indices and it will traverse the
> >> array and finally get or set the value.
> >>
> >> peek: func [ "Gets/sets the value from a multi-dimensional array."
> >> block [ block! ] "Multi-dimensional array"
> >> index [ integer! pair! block! ] "Offset(s) into the array"
> >> /! value [ any-type! ] "Value to replace index with"
> >> ] [
> >> either ! [
> >> switch type?/word index [
> >> integer! [ change at block index value ]
> >> pair! [ change at pick block first index second index value
> ]
> >> block! [
> >> either (length? index) = 1 [
> >> change at block first index value
> >> ] [
> >> peek/! pick block first index next index value
> >> ]
> >> ]
> >> ]
> >> ] [
> >> switch type?/word index [
> >> integer! [ pick block index ]
> >> pair! [ pick pick block first index second index ]
> >> block! [
> >> either (length? index) = 1 [
> >> pick block first index
> >> ] [
> >> peek pick block first index next index
> >> ]
> >> ]
> >> ]
> >> ]
> >> ]
> >>
> >> As I'm still learning REBOL, I'm hoping for some critiques and
> >> suggestions.
> >> But any hints as to why this functionality isn't there to begin with
> (if
> >> it
> >> isn't that is), would be good too. :-)
> >>
> >> Thanks!
> >>
> >> Jeff M.
> >>
> >> --
> >> massung-gmail.com
> >>
> >> --
> >> To unsubscribe from the list, just send an email to
> >> lists at rebol.com with unsubscribe as the subject.
> >>
> >
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> >
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